The kind of plate boundary in San Andreas fault is transform plate boundary.
The San Andreas Fault is a continental transform fault that extends approximately 1,200 kilometers (750 mi) through California. It forms the tectonic boundary between the Pacific plate and the North American plate, and its motion is lateral (horizontal) sliding to the right. The fault divides into three segments, each with different characteristics and different seismic risks. Sliding rates along the fault ranged from 20 to 35 mm (0.79 to 1.38 in)/year. It is formed by a transform boundary.
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